Annual report pursuant to Section 13 and 15(d)

Note 7 - Preferred Stock, Warrants and Options - Shares Authorized Under Stock Option Plans (Details)

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Note 7 - Preferred Stock, Warrants and Options - Shares Authorized Under Stock Option Plans (Details)
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Option Outstanding, Number Of Options (in shares) 2,950,262
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 1 year 182 days
Option Exercisable, Number Of Options (in shares) 2,950,262
Exercise Price Range One [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 0.24
Option Outstanding, Number Of Options (in shares) 208,160
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 9 years
Option Exercisable, Number Of Options (in shares) 208,160
Exercise Price Range Two [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 0.04
Option Outstanding, Number Of Options (in shares) 2,666,667
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 328 days
Option Exercisable, Number Of Options (in shares) 2,666,667
Exercise Price Range Three [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 3
Option Outstanding, Number Of Options (in shares) 66,667
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 109 days
Option Exercisable, Number Of Options (in shares) 66,667
Exercise Price Range Four [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 52.50
Option Outstanding, Number Of Options (in shares) 4,383
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 2 years 182 days
Option Exercisable, Number Of Options (in shares) 4,383
Exercise Price Range Five [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 70.26
Option Outstanding, Number Of Options (in shares) 3,449
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 4 years 182 days
Option Exercisable, Number Of Options (in shares) 3,449
Exercise Price Range Six [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 420
Option Outstanding, Number Of Options (in shares) 565
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 3 years 146 days
Option Exercisable, Number Of Options (in shares) 565
Exercise Price Range Seven [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 577.50
Option Outstanding, Number Of Options (in shares) 155
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 292 days
Option Exercisable, Number Of Options (in shares) 155
Exercise Price Range Eight [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 2,520
Option Outstanding, Number Of Options (in shares) 196
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 73 days
Option Exercisable, Number Of Options (in shares) 196
Exercise Price Range Nine [Member]  
Option Outstanding, Exercise Price (in dollars per share) | $ / shares $ 10,500
Option Outstanding, Number Of Options (in shares) 20
Option Exercisable ,Weighted Average Remaining Life In Years (Year) 109 days
Option Exercisable, Number Of Options (in shares) 20